Add debug argument

.github/workflows/main.yml

@@ -46,3 +46,7 @@ jobs:
           format: doesnotexist # gets ignored if format set in args
           output: /tmp/foo.txt
           fail: true
+      - name: test debug
+        uses: ./
+        with:
+          debug: true

action.yml

@@ -5,6 +5,10 @@ inputs:
     description: "Lychee arguments (https://github.com/lycheeverse/lychee#commandline-parameters)"
     default: "--verbose --no-progress './**/*.md' './**/*.html'"
     required: false
+  debug:
+    description: "Enable debug output in action (set -x). Helpful for troubleshooting."
+    default: false
+    required: false
   fail:
     description: "Fail entire pipeline on error (i.e. when lychee exit code is not 0)"
     default: false
@@ -46,10 +50,11 @@ runs:
         # https://github.com/actions/runner/issues/665
         INPUT_GITHUB_TOKEN: ${{ inputs.GITHUB_TOKEN }}
         INPUT_ARGS: ${{ inputs.ARGS }}
-        INPUT_FORMAT: ${{ inputs.FORMAT }}
-        INPUT_OUTPUT: ${{ inputs.OUTPUT }}
+        INPUT_DEBUG: ${{ inputs.DEBUG }}
         INPUT_FAIL: ${{ inputs.FAIL }}
+        INPUT_FORMAT: ${{ inputs.FORMAT }}
         INPUT_JOBSUMMARY: ${{ inputs.JOBSUMMARY }}
+        INPUT_OUTPUT: ${{ inputs.OUTPUT }}
       shell: bash
 branding:
   icon: "external-link"

entrypoint.sh

@@ -1,5 +1,11 @@
 #!/bin/bash -l
-set -uxo pipefail
+set -uo pipefail
+
+# Enable optional debug output
+if [ "${INPUT_DEBUG}" = true ]; then
+  echo "Debug output enabled"
+  set -x
+fi
 
 LYCHEE_TMP="/tmp/lychee/out.md"
 GITHUB_WORKFLOW_URL="https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}?check_suite_focus=true"